# How much of “Doctor Who” might really be possible?

Science shows why Doctor Who is so special.

As Doctor Who’s 50th anniversary looms, time travel is everywhere – on the screen, at least. Famously, the Doctor can whizz through the years using a “dimensionally transcendental” machine, the TARDIS, and make changes to the past as and when he likes. But what is time travel – and how much of “Doctor Who” might really be possible?

A handy definition of time travel comes from philosopher David Lewis. Lewis says time travel involves a journey having different durations viewed from outside (in “external time”) or from inside (in “personal time”). Suppose you spend five minutes travelling aboard your machine, as measured by (e.g.) your watch and your memories. On arrival, you find 150 years have elapsed in the outside world. Congratulations, you have time-travelled. Five minutes of your personal time has covered 150 years of external time.

Odd as this sounds, Einstein’s theory of Special Relativity introduced such possibilities to physics in 1905. The theory says: the duration of a process varies with the relative velocity of the observer. The closer that relative velocity gets to the speed of light, the longer the travelling process takes.

Suppose you want to see the Earth a billion years hence, but worry you have only about 50 personal years left. Special Relativity specifies that if you travel very close to the speed of light relative to the Earth, your 50 personal years can cover one billion Earth years.

In backward time travel, personal and external time differ in direction, so journeys end in external time before, not after, they begin; you spend five personal minutes travelling 150 years into the external past. General Relativity suggests that the universe is essentially curved spacetime, which might allow such divergences of external and personal time.

Relativity treats space and time as aspects of a single entity: “spacetime”. One of the more remarkable features of General Relativity is that it allows time and space axes to be interchanged, so one observer’s space axis can be another observer’s time axis.

In 1949, Austrian mathematician Kurt Gödel used General Relativity to describe a universe where intrepid voyagers can go anywhere in (past or future) time without travelling faster than light. Gödel’s universe has no boundaries in space or time, and all the matter in it rotates. But our finite, non-rotating universe is not Gödel’s. Despair not though – simply spin an ultradense, very (maybe infinitely) long cylinder very fast. Spacetime should curve around the cylinder so the direction of the local future partially points into the external past. Such devices are called “Tipler Cylinders”, after physicist Frank Tipler.

Better yet, quantum theory suggests that “wormhole” connections between different spacetime points spontaneously form and break all the time. The chances are that natural wormholes are tiny - vastly smaller even than an electron, (and a billion trillion electrons can fit in a teaspoon). But you could perhaps find (or create) a wormhole big enough and durable enough to let you slip through into the past. Difficult, but theoretically possible.

## No, you can’t kill your physics teacher

So perhaps you could travel into the past. But what about paradoxes? What is to stop you assassinating your grandfather or yourself as infants? One answer says: logical consistency.

Classical logic says you cannot consistently kill in infancy someone who achieves adulthood. But, Lewis says, time travel need not involve doing the logically impossible – provided travellers’ actions in the past are consistent with the history whence they come. So you could try killing your baby grandfather, but something would foil you – you would sneeze, or your gun would jam. Lewisian time travel is therefore (classically) consistent, but might look very strange, since seemingly possible actions (like shooting an unprotected infant) would prove impossible.

Another view says that backward time travel requires many worlds – that is, many different but equally real versions of physical reality. Physicist David Deutsch and philosopher Michael Lockwood argue that time travel must involve inter-world travel. If you travel backwards in time, you must arrive in a history different from your native one and so would be quite unfettered by your past once you get there. You could even kill this other history’s counterparts of your grandfather and yourself.

Both these concepts of backwards time travel may disappoint anyone wanting to change the “one and only” past. Conventional logic says time travellers would either help make history what it was (Lewis) or create a different history (Deutsch/Lockwood). However, quantum logic might let travellers change the actual (one-and-only) past.

Suppose we hold that quantum measurements determine (or change) quantities measured, even if those quantities lie in the past. Someone could travel back and “observe” history turning out differently from how it originally was, thereby retrospectively making actuality different from what it had been. What would happen to travellers who rebooted history is not clear, but this model seems closer to the time travel familiar from “Doctor Who” and other fictions. Beware, though, because quantum theory allows no predicting, and still less controlling, of the outcomes of changing the past. There would be no way to foresee the effect you would have on the present.

So classical logic, General Relativity and quantum theory all seem to permit time travel. Classical logic plus General Relativity suggest backward travellers face weird consistency constraints. Many-worlds travellers face no constraints, but get displaced into different histories. Quantum-logic travellers could change the (one and only) past without constraints, but they couldn’t predict or control what they would get.

So far, however, it seems only the Doctor knows how to change the past at will.

Alasdair Richmond received funding from the Arts and Humanities Research Council, to fund one semester of a two-semester leave period that covered the academic year 2008-2009.

The eleven incarnations of the Doctor. Image: BBC/Matt Burlem

Alasdair Richmond is a Senior Lecturer in Philosophy at the University of Edinburgh.

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# Everything is illuminated: Rowan Williams on the art and faith of David Jones

Haunted by his time in the trenches and disturbed by the modern marketplace, Jones formed a world-view full of symbols and connections.

In 1967, the poetry magazine Agenda published a special David Jones issue, including a number of unpublished fragments of his work. The first of these was the brief piece entitled “A, a, a DOMINE DEUS”, often reprinted as Jones’s most poignant statement of his sense that the world of technology was making the writing of poetry – and indeed the other arts – impossible: “I have watched the wheels go round in case I/. . . might see the Living God projected/from the Machine . . ./my hands found the glazed work unrefined and the terrible/crystal a stage-paste”.

He had elaborated on this two decades earlier in a note addressed to the doctor who was treating his paralysing depression and anxiety. We are living, he wrote, in a culture where objects are thought of in terms of their usefulness. An electric light bulb is designed to illuminate human dwellings or workplaces; if an artist wants to evoke something about light more generally, the light bulb is not a good metaphor, because it is merely a functional object. It is what it is because of the job it has to do. But we need images that are allowed to resonate more freely because they are not determined in this way – fires, stars, the sun. How then does the artist avoid “a kind of invalidity”, a corrupting distance from the actual world of his or her experience?

Jones often wrote about “the Break”, the cultural moment somewhere around the beginning of modernity when the European world-view shifted decisively. Instead of a world where things were unique but linked by an unimaginable density of connection and cross-reference, we had created one in which things were unconnected but endlessly repeatable and where everything could be exchanged in the market for an agreed equivalent: above all, for money. Jones saw his work – both as a visual artist and as a poet – as a sustained protest against the Break and an effort to show that the older picture could, after all, be brought to life.

Born in 1895, he had family roots that helped to shape his interests from the beginning. His mother’s father had been a London shipwright and his father’s origins were in North Wales. Both Wales and London kept a central place in his imagination throughout his life. It was not surprising that when the First World War broke out, he enlisted in the 1st London Welsh Battalion of the Royal Welch Fusiliers. His 1937 masterpiece, the astonishing book-length poem In Parenthesis, describes the experience of foot soldiers in the First World War, revisiting his own experiences up to and including the disastrous engagement at Mametz Wood in July 1916. Jones was wounded in the leg during the battle (a wound described by the medical orderly as “a beautiful blighty” – serious enough to get him off the front line, yet not life-threatening). But he was back in the trenches in a matter of months.

The traumas of war stayed with him to the end. In Parenthesis, which he struggled with painfully over many years, is one of the most unsparing accounts of the life of infantry soldiers in the trenches and of the horrors of the Somme; but at the same time it meditates on any number of connections – echoes of conflict, from Troy to the struggles of the British against the Saxons in the 6th century to Malory’s Arthurian narratives, and, woven through it all, the founding act of bloodshed that is the death of Christ. Jones was raised an Anglican, but by the time he wrote In Parenthesis he was a Catholic, and believed passionately that the Church’s sacramental theology was what made sense of a world of symbolic connection, where nothing existed as an atom but where everything enriched the perception of everything else. For him, all art rested on the conviction that God had made a world of endless cross-reference, and that humanity was most fully human when it acknowledged this. Art was humanity doing what only humanity could do.

Thomas Dilworth’s welcome (and superbly produced) biography will clearly be the point of reference for Jones’s life for a long time to come. Dilworth has already written extensively about Jones, most recently a full and valuable account of the wartime years, and his research is exhaustive. He quietly corrects a number of errors in earlier biographical sketches and provides a wealth of detail at every stage – and he tells us that this substantial book is only part of a longer document that he intends to publish online. In all the detail, it is hard to pick out a single thesis; but in so far as there is one, it is that Jones is “the foremost native British modernist”, as Dilworth claims in his concluding paragraph.

This may sound strange, given what we know about “the Break”. But in fact, Jones himself believed that the modernist, post-impressionist aesthetic was a decisive break of its own kind – a break with representation as a sort of substitution, a recognition that a work of art is a thing in which something else is allowed to come to life, in a new medium: a picture is the scene or the human figure existing in the form of paint, as the Mass is the flesh of Jesus existing as bread. He insisted that his Catholic conversion began with his artistic conversion, and tried persistently, in his superb essays as well as his artistic output, to show what this meant.

The artistic conversion was dramatic enough. Dilworth reproduces some of the technically skilful and aesthetically awful work of Jones’s early art-school days, as well as some startling propaganda pictures from the war years: languishing virgins being threatened by hairy medieval Teutons, and so on. Jones needed to rediscover the extraordinary talent of his early childhood, when he produced sketches of a delicacy and vigour that foreshadow the very best of his mature work. Immediately after the war, back at the art school in Camberwell, he let his imagination be opened up by a variety of new impulses, ranging from El Greco to Samuel Palmer and Pierre Bonnard.

But Jones’s distinctive touch as an artist came to life when he threw in his lot with his fellow Catholic convert Eric Gill. He shared the life of the Gill family frequently for nearly a decade, in both Sussex and the Welsh borders, imbibing Gill’s distinctive artistic philosophy and gently but steadily distancing himself from it, and was for a while engaged to Gill’s second daughter, Petra. Gill mocked Jones for continuing to paint watercolours, insisting that carving and engraving were intrinsically more serious matters because of the manual work involved: watercolours were just decorative, the worst possible thing for a work of art to be, in his book. The Gill circle was a crucial stimulus for Jones, but ultimately one that allowed him to sharpen up his own understanding rather than adopt an orthodoxy. The watercolours, gouaches and engravings of the 1920s show a striking confidence. In 1928 he was nominated by Ben Nicholson for membership of the “7 & 5 Society”, probably the leading group of artistic innovators in 1920s Britain.

Jones’s acute and recurrent depression and worsening anxiety held back his output in the 1930s, though he struggled through to the completion of In Parenthesis. The later visual works – drawings, paintings, inscriptions – display an exceptional range of idioms and are increasingly characterised by abundant detail that is of filigree precision as well as unusual fluidity. There are religiously themed pictures: Vexilla Regis (1948), the great symbolic tree in the forests of post-Roman Britain standing for the cross as a sort of world-tree; the Welsh hill landscape framing the Annunciation in Y Cyfarchiad i Fair (1963), with its abundance of exquisitely observed small native birds. There are the “calix” paintings of glass vessels holding flowers, which deliver an effect of profound translucency. There are the inscriptions of Latin, Welsh and English texts, a unique corpus of work in which he defined a new approach to “monumental” lettering as an art form. These are perhaps the lasting legacy of his apprenticeship to Gill, yet they are anything but derivative.

In the middle of all this, in the postwar period, he continued to write, producing another unclassifiable poetic masterpiece, The Anathemata (1952), an exploration of both personal and cultural history, with the events of Maundy Thursday and Good Friday at the centre of everything. Other “fragments”, many of them very long, were worked on over years but never found their connecting thread; most of these were not published until after his death.

Dilworth provides a comprehensive account of Jones’s struggles with mental health. He was fortunate enough to find a sympathetic therapist who strongly encouraged him to keep working; but later on, a formidable regime of antidepressant and other drugs left him less able to focus – “groggy and slow”, as he said – and his productivity declined sharply. A temperamental indifference to social encounters combined with tormenting agoraphobia to make him ever more of a recluse in a succession of north London boarding houses and nursing homes until his death in 1974.

Yet his friendships were immensely important to him – friendships with members of the lively and critical world of Catholic artists in the 1920s, with younger artists and writers, to whom he was unfailingly generous, and with the two young women, Prudence Pelham and Valerie Wynne-Williams, who were the recipients of his strongest (but unconsummated) attachments. The breaking of his engagement to Petra Gill had been a great trauma, and his lifelong celibacy seems to have been the result both of this shock and of a deep-seated conviction that his artistic vocation could not accommodate ordinary family life.

He was a wonderful letter-writer; anyone wanting to get to know Jones should start with Dai Greatcoat, the selection from his letters published in 1980 by his friend René Hague (Gill’s son-in-law). Funny, ­affectionate, eccentrically learned, curious, irreverent and sad, they give a good sense of why Jones was so deeply loved by those who knew him. He viewed the world – and his own work and calling – with a gentle and vulnerable bafflement, but also with patience and humility. He seems to have had no malice in his make-up.

Dilworth does not, however, shirk the embarrassing fact that Jones expressed a measure of sympathy for Hitler in the 1930s. This should not be misunderstood. What Jones says is that, having read Mein Kampf, he feels it is almost right, but ruined by hatred and racial triumphalism. Hitler appears to him more appealing than most of his opponents, who represent international finance and impersonal bureaucracy, or Marxist collectivism. He later admits that he was simply wrong. But it is a revealing wrongness: he accepts at face value a rhetoric that opposes the market, and he seems to see Hitler’s passion and violence as at least a more honest response to national or global crisis than the “business as usual” of mainstream politicians. And how far are Hitler’s “opponents” being tacitly understood as the cosmopolitan financiers of anti-Semitic myth? Dilworth does not absolve Jones for dipping his toe into this swamp; but he does note that Jones was – more than many of his Catholic colleagues – intolerant of the anti-Semitism of much traditional Catholic thought and shocked by the persecution of the Jews in Germany. It is another sidelight on his fundamental artistic problem: a disgust with managerial, commodified mod­ernity that, in his case as in some others, can make a quite different anti-modernity, the fascist refusal of public reasoning and political pluralism, fleetingly attractive.

The other delicate issue that Dilworth handles carefully and candidly is whether Jones was aware that Eric Gill had sexually abused two of his daughters (including Petra). His conclusion is that it is very unlikely, and this is almost certainly right. And yet, looking at Jones’s haunting painting of 1924 The Garden Enclosed, with its depiction of himself and Petra embracing awkwardly, Petra apparently pushing him away, with a broken doll lying on the path behind her, it is hard not to believe that he intuited something deeply awry somewhere. The background presence of Gill’s omnivorous sexual appetite can hardly not have been a further complication in an already complicated relationship.

Jones’s reputation has probably never been higher. There have been several important exhibitions in recent years and Dilworth’s assessment of his standing among British modernists is increasingly shared. His thoughts as an essayist on theology as well as aesthetics have been increasingly influential. This biography is a landmark. It would be good if it stirred an interest not only in Jones as an artist and poet, but in the questions he faced about modernity: what happens to art in a culture where each thing is no more than itself, or its market price?

"David Jones: Engraver, Soldier, Painter, Poet" by Thomas Dilworth is published by Jonathan Cape (432pp, £25)

Rowan Williams is an Anglican prelate, theologian and poet, who was Archbishop of Canterbury from 2002 to 2012. He writes on books for the New Statesman

This article first appeared in the 23 March 2017 issue of the New Statesman, Trump's permanent revolution